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An abundance of healthy green foliage, but no flowers: what’s wrong?

Most daylilies (Hemerocallis cvs) bloom year after year without your having to do much of anything: they are very reliable and very permanent plants. But some varieties, even though they are treated the same way and grow under the same conditions, bloom less after they have been in the ground 5 or 6 years. They may stop blooming entirely. The very popular ‘Stella de Oro’ daylily – the mostly widely sold daylily in the world – belongs to this category. After a number of years, it just doesn’t bloom the way it used to. What’s wrong?

Competing With Itself

If a daylily is no longer blooming well yet others around it are still going strong, the problem most likely has nothing to do with fertilizing, watering, exposure, or other cultural factors, but rather results from overcrowding. And not overcrowding caused by other plants (most daylilies can hold their own in that department!), but with itself. It has produced so many offshoots that there is now a profusion of plants that share the same space, each competing with its neighbors for light and minerals. This intense competition reduces or eliminates flowering. It’s as simple as that.

Time to Divide

And the solution is just as simple: divide the plant. Maybe not when you notice the problem, in midsummer, but either in the fall (at least one month before the first frost) or the spring, when new shoots start to appear. That’s because daylilies respond better to division when they are more or less dormant. (And in the fall, even though they still have leaves, the average daylily is pretty much asleep.)

That said, you can divide a daylily in summer if you really want to, but it’s more of a shock to the plant and it’s therefore extra important to water regularly to help it make a complete recovery.

Daylily Division

Dividing a daylily is pretty basic.

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Dividing a daylily in the fall: you can cut the foliage back if you prefer.

Start by just digging up the entire plant with a spade, taking the biggest root ball possible. If you do it late in the season (late August, September), you can shear the foliage to 8 inches (20 cm) high before starting so you can better see what you’re doing… if you want to (shearing is not absolutely necessary).

Slice through the plant with the spade to cut it into 2, 3, 4 or more sections. Each section must have at least one  healthy fan; preferably 3 or more. Now replant each section without burying the crown (the junction between the roots and the stem)… in other words, plant it with its leaves at the same level as they were before the division.

After the division, water well and apply a mulch. The plant will need additional watering in case of drought until it is well established and that can take a full year.

If you end up with too many plants, no problem: they make great gifts for friends and neighbors!

Once replanted, your divided daylily will likely flower at least modestly its first season and heavily from then on. And after 5 or 6 years, since it is one of those daylilies, it will be time to repeat the process!

Larry Hodgson is one of Canada’s best-known garden communicators. He has notably been editor-in-chief of HousePlant Magazine, Fleurs, Plantes et Jardins, À Fleur de Pot and Houseplant Forum magazines and is currently the garden correspondent for Le Soleil and radio garden commentator for CKIA-FM Radio. He has written for many garden publications in both the United States and Canada, including Canadian Gardening, Harrowsmith, Horticulture, Fine Gardening and Organic Gardening. He also speaks frequently to horticultural groups throughout Canada and the U.S. His book credits include The Garden Lover’s Guide to Canada, Complete Guide to Houseplants, Making the Most of Shade, Perennials for Every Purpose, Annuals for Every Purpose, and Houseplants for Dummies, as well as nearly 60 other titles in English and French. He is a past president of the Garden Writers Association (now Garden Communicators International) and the winner of the prestigious 2006 Garden Media Promoter Award offered by the Perennial Plant Association. He resides in Quebec City, Quebec, Canada.

5 comments on “When Daylilies Stop Blooming

  1. Just divided my new favorite daylily, going bananas, for the first time this year.

  2. Rosemary

    The leaves of my Lillie’s turn brown in July can I cut them back in the summer

    • You can cut back any leaf that turns brown. But lily leaves shouldn’t be turning brown at this season. I suspect they might be something other than lilies or daylilies.

  3. gaille musgrove

    My day lilies and my Stellas are turing brow and have been since mid July. Is it possible that they have oo much sun as they are in a very hot location with full sun.

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